Fuel injection system pump



Jan. 19, 1960 w. BENNETT FUEL INJECTION SYSTEM PUMP 3 Sheets-Sheet 1 Filed April 26, 1957 R M m 7 m, e N w B 1 n .L M mm n 8 I W a, l 2 w. a V M. 0 2 a 7 w E P? x 3 w 8 W Q 04. w n

Jan. 19, 1960 w. L. BENNETT FUEL INJECTION SYSTEM PUMP 3 Sheets-Sheet 2 Filed April 26, 1957 m "M 5 y W92 w w Jan. 19, 1960 w. L. BENNETT FUEL INJECTION SYSTEM PUMP 3 Sheets-Sheet 3 Filed April 26, 1957 Worthy L. Bennett INVENTOR. 40gb BY fil FUEL INJECTION SYSTEM PUMP Worthy L. Bennett, Cottonwood, Ariz., assignor of onefourth to K. Norton, Cottonwood, Ariz.

Application April 26, 1957, Serial No. 655,210

3 Claims. (Cl. 103 -38) This invention relates in general to new and useful improvements in pumps, and more specifically to improvements in pumps of the van'able output type.

The primary object of this invention is to provide an improved pump of the variable output type, the pump including a plurality of pump units mounted in a housing in concentric circumferentially spaced relation with re- ;spect to a shaft carried by the housing, there'being provided drive means on the shaft which is adjustable for varying the eifective stroke of the individual pump unit so :as to vary the output of the pump.

Another object of this invention is to provide an improved pump, the pump including a housing having carried thereby a shaft, there being also carried by the housing in concentric relation with respect to the shaft a plu- Ialityof circumferentially spaced pump units, a floating annular member engaging said pump units and being disposed about the shaft, there being carried by the shaft a drive member engaging the annular member and causing movement of the annular member in an eccentric path :so as to sequentially actuate said pump units.

Another object of this invention is to provide an improved pump which utilizes a plurality of individual pump units of the bulb type, each of the pump units being continuously engaged by a free floating annular member, there being carried by the housing a drive shaft including cam type drive means engaged with the annular member for effecting movement of the annular member in a concentric path whereby the bulb type pump units are sequently compressed and released so as to effect a pumping action.

A further object of this invention is to provide an improved fluid pump of the variable capacity type which is suitable for use in conjunction with a fuel injection system or the like, the pump including a plurality of individual pump units and there being provided drive means for the individual pump units which is adjustable so as to vary the effective stroke and output of the individual pump units.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinfater described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a schematic plan view of an internal combustion engine which is shown in dotted lines and which has mounted thereon the pump which is the subject of this invention as part of a fuel injection system thereof;

Figure 2 is an enlarged fragmentary longitudinal sectional view takenv substantially upon the plane indicated by the section line 22 of Figure l and shows the specific internal construction of the pump;

Figure 3 is an enlarged fragmentary sectional view taken through an upper part of a supply manifold for the pump and shows both the connection of one of the pump units to the supply manifold and a supply line to the manifold;

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Figure 4 is an enlarged fragmentary sectional view taken through an outlet of one of the pump units and shows the details of an outlet valve and the connection of the outlet of the pump unit to a discharge line;

Figure 5 is an enlarged transverse sectional view taken substantially upon the plane indicated by the section line 5-5 of Figure 2 and shows further the details of the P p;

Figure 6 is an enlarged fragmentary sectional view showing a portion of the pump unit as illustrated in Figure 5 with the eifective stroke of the pump being increased;

Figure 7 is a fragmentary longitudinal sectional view taken through the center of the pump and shows the cam type drive member as being in a position of minimum stroke; and

Figure 8 is a fragmentary longitudinal sectional view similar to Figure 7 and shows the cam type drive member in a position of substantially maximum stroke.

Referring now to the drawings-in detail, it will be seen that there is illustrated the pump which is the subject of this invention, the pump being referred to in general by the reference numeral 10. The pump 10 includes a housing which is referred to in general by the reference numeral 12. Thehousing 12 is formed in two halves 14 and 16, the housing 12 being split transversely. The halves 14 and 16 are releasably clamped together by means of longitudinally extending bolts 18 which are circumferentially spaced and which are best illustrated in Figure 5.

The housing halves 14 and 16 have relatively thick abutting flange portions 20 and 22, respectively, which are internally recessed to form a plurality of pockets 24 which are circumferentially spaced. Seated in each of the pockets 24 is a bulb type pump unit which is referred to in general by the reference numeral 26. Each bulb type pump unit 26 includes a'spherical bulb member 28 which may be formed of any flexible resilient material including metal, rubber or plastic. Each of the bulb members 28 has formed integrally therewith an inlet tube 30 and a discharge tube 32. The inlet tube 30 and the discharge tube 32 of each of the pump units 26 are disposed at right angles to each other with each inlet tube 30 being disposed in a longitudinal bore 34 in the flange 20 and each discharge tube 32 being disposed in a radial bore 36 between the flanges 20 and 22.

Aligned with the pockets 24 and extending into the interior of the housing 12 is an annular trackway 38. Seated in the annular trackway 38 for floating movement is an annular member 40. The annular member 40 engages the pump unit 26 and is shiftable so as to compress the bulbs 28 and effect a pumping operation.

The housing half 14 includes an end wall 42 having a recess 44 in which there is mounted a bearing 46. The housing half 16 includes an end wall 48 having a recess 50 in which there is mounted a bearing 52. The bearings 46 and 52 are aligned and have rotatably journaled therein a drive shaft 54. The drive shaft 54 has one end thereof terminating in the end wall 42 and the opposite end thereof projecting through a boss 56 carried by the end wall 48. A

Carried by the shaft 54 within the housing 12 is a cam type drive unit which is referred to in general by the reference numeral 58. The cam type drive unit 58 includes a circular support 60 which is mounted in alignment with the annular member 40. As is shown in Figure 5, the support 60 is provided with a radially extending recess 62 which includes a relatively wide outer portion 64 and a narrower inner portion 66. The recess 62 is aligned with a longitudinally extending trackway 68 formed in the shaft 54.

Disposed within the recess 62 for radial movement is 76 and the roller 74engagesthe internal 'surfaceof 'the annular member 405 In order that the roller 74 inay be selectively posi tioned, there is positioned'within the trackway*68"'a"wedge member 78. The wedge-inember"78 is provided at the it may bereadily'use'd as a fuel injection pump, it is to end thereof remote fromthe' suppo'rt 60with a circular collar 80. Engaged with the circular coliar 30, as is I best shown in Figure-2, is abifurcated head 82*of a shift member 84. The shift member 84 is journaled'for longi tudinal sliding movement "in an opening 86 *in the end ate sequentially.

wall 48. In order that the member 78 may be positioned from a remote point, thereis pivotally connected to the shift member 84by means-"of 'a pivot 'pin 88 control i link 90.

As is best shown in Figure 5, the annular member 40 is of an outer diameter so' 'as'to engage all of'the bulb members 28 without substantially compressing thein.

This is a shut-off position'of the pump 10. When'it is desired for the pump10 to pump, the Wedge member78 is shifted longitudinally to the left, as viewed in Figures 7 and 8, and as a result, the roller 74 is shifted outwardly from the axis of the shaft 54. Thiscauses an eccentric movement of the annular member 40 when the shaft '54 rotates so that the bulb members 28 are progressively and sequentially compressed in the least.

Referring once again to Figure '2 in particular, it will be seen that there is secured to the end wall 42 by means spring loaded type,'which check valve assembly permits the flow of a liquid of the manifold 96 into oneofthe inlet tubes 30 only.

In order that a liquid may be supplied to the supply manifold 96, the manifold 96 also includes an inlet fitting 166. The inlet fitting 106 has connected thereto a supply line 108, as is best shown in Figure 3.

Referring'now to Figure 4 in particular, it will be seen that there is illustrated'a connection between one of the discharge tubes 32 and a discharge line 110. The connection includes a fitting which is referred to in general by the referencenurneral 112. The fitting 112 includes a half 114 carried by the discharge tube 32 and which is releasably coupled to a half 116. The half 116 includes a retaining nut 118 which in turn clamps the discharge line 110 to the half 116. Positioned within the fitting 112 is a spring loaded check valve 120 which permits flow in one direction only,"the direction of flow being from the discharge tube 32 into the discharge line 110.

Referring now to Figure 1 in particular, it will be seen that the pump 10 is illustrated as being mounted on an internal combustion engine of the V-8 type, the engine being referred to in general by "the reference numeral 122. The engine= 122 inc1udes a distributor 124 and the pump 10 will be driven from the distributor 124 in any desired manner. It will most likely be preferred that the shaft 54 go into a special adapter (not shown) mounted beneath the distributor 124. When the pump 10 is mounted in an automobile, the control link 90 will be connected to the conventionalaccelerator pedal. If desired, the supply line 108 may be connected to a fuel 5 pump, such as the fuel pump 126 so that it may receive its fuel supply under pressure. The discharge lines 110 will be connected to injectors'128 carried by the halves 130 of the internal combustion engine 122.

Although the pump 10 isof a construction whereby be understood that the use thereof is not so limited. The pump 10 may be used for pumping oils or other liquids and may beused in conjunction with any operation which requires a pluralityof individual pump units which oper- The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows: l. A pump comprising a housing, a shaft rotatablyjour'naled in said housing, a plurality of individual pump trically about said shaft, inlet tubes and discharge tubes respectively including inlet and discharge check valves therein communicating with each of said bulbs, an an-'- nular supply manifold, each of said inlet tubes connected to said supply manifold, a free floating annular member a,

mounted in said housing, said annular member being normally in engagement with all of said bulbs for actuating said'pump units and being supported thereby, a cam type drive unit carried by said shaft and engaging said annular member to move said annular member in an eccentric path whereby said pump units are sequentially actuated, said cam type'drive unit being of the adjustable typefor varying the movement of said annular member and t the stroke of said pump units, said cam type drive unit ineluding a support member carried by said shaft, a support arm mounted in said support member for movement in a radial direction, a roller terminally and rotatably carried by said support arm engaging said annular member, and means engaged with said support arm for positioning said support arm radially of said shaft.

2. The combination of claim'l wherein said last named mcans'include a wedge member slidably along said shaft.

3. The combination of claim 1 wherein said last named means includes a longitudinal trackway in said shaft, one

end of said support arm being disposed in said trackway,

a wedge member positioned in said trackway for longitudinal sliding movement, said wedge member engaging said one end of said support arm.

References Cited in the file of this patent UNITED STATES PATENTS 271,257 Morton Jan. 30, 1883 2,270,816 Zonis 2 Ian. 20, 1942 2,370,383 Wallace Feb. 27, 1945 2,545,774 Griswold Mar. 20, 1951 2,624,284 Straub Jan. 6, 1953 FOREIGN PATENTS skilled in the art, it is not desired to limit the invention 1 units'carried by said housing, said pump units eachineluding a compressible bulb and being arranged concen- France Feb. 11, 1946" 

